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Sansui 3000 main caps wired in backwards from factory

Discussion in 'Exclusively Sansui' started by kwayde, Feb 6, 2018.

  1. restorer-john

    restorer-john Addicted Member

    Messages:
    6,247
    Location:
    Australia
    I need some street creds, maybe I should get some of these shirts made up?

    muse.JPG

    :)
     

     

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  2. Bob

    Bob AK Subscriber Subscriber

    Messages:
    2,113
    Location:
    West coast
    yep - only if you wear this shirt when listening to the MUSE enhanced unit.

    and make sure your customer is NOT color blind and can't tell red from green
    and
    do not let him drive anywhere in the first or second worlds.
     
  3. McGowdog

    McGowdog Active Member

    Messages:
    136
    Location:
    Pueblo, Colorado
    This is what I was thinking.

    My Kenwood L09s have a + and - rail, 105 iirc, and the negative rail caps are right next to the positive rail one(s) and it looks strange but hey, we're dealing with negative voltage, so it seems to work pretty good.

    Would like to see someone fry those 18,000 ,uF caps but not on my amps. Like say, if I saw my ex-mother-in-law working on the thing. Well you gotta put her tongue on it, Leona.
     
  4. Leestereo

    Leestereo Super Member

    Messages:
    2,088
    Location:
    Ottawa, ON
    +1

    This approach is perfectly acceptable for signal path capacitors, but not for capacitors used solely for filering DC voltage in a power supply. When bi-polar electrolytic capacitors (that comprise of two formed aluminum oxide foils) are subject only to DC voltage, one of the layers is "working" and the other one degrades because it is always reverse biased. Eventually, this bi-polar electrolytic capacitor becomes a polarized one (but not as good as a real polarized capacitor since the non-working oxide layer just adds more ESR).
     
    Hyperion, Overundr1 and Hipocrates like this.
  5. Overundr1

    Overundr1 AK Subscriber Subscriber

    Messages:
    2,512
    Location:
    Mississippi
    Way late to the party here. You are fortunate that a main cap did not explode on you if full inverse voltage was applied. The big ones can do serious collateral damage if this happens.
     
    Leestereo and Hyperion like this.

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